Readers will note that this same scenario, huge disks descending from the sky to settle over Earth's capital cities, destroying them with descending rays, has been used many times since.

About a year and a half after Hilary's departure into trackless space, a huge flat diskoid came hovering to the ground near Great New York. It carried a party of Mercutians on a friendly exploration, so they said, once communication could be established between Earth linguists and themselves. They were welcomed, made much of. They seemed friendly enough. At their own request they were whirled over the Earth in Earth planes on a tour of inspection.

When they departed, with much protestation of friendship, they assured President Peabody they would return some day, they and others of their race. Just what hidden threat there was in that promise, no one on Earth realized. It was taken at face value.

Just a year later, almost to the day, the by this time familiar diskoid was seen hovering once more over Great New York. The Mercutians were returning. The people of New York suspected nothing. No troops were rushed to the scene to repel invasion; no guns were trained on the space ship. It was just another friendly visit, and hurried preparations were commenced for a rousing welcome on their landing.

What New York did not know was that simultaneously with the appearance of the Mercutian flier over their city, a hundred others were even then hovering over the strategic capitals of the world. The first Mercutian ambassadors had put to good advantage that hurried tour of inspection.

No one was alarmed. Each capital city thought itself signally honored by the reappearance of the lone Mercutian over it. The plan was clever, the timing perfect.

At a signal flashed through the ether, things started happening.

The great diskoids, hovering high in the stratosphere, suddenly blazed into blinding light. To the dazzled onlookers below, a new sun seemed to have been born. A truncated cone of flame leaped downward. The diskoid was the apex, the spreading base all of Great New York. The sheeted brilliance enveloped the doomed city. It was a holocaust. New York became a roaring furnace. Stone and steel heated to incandescence.

The affrighted people had no chance for their lives. Like moths in a flame they died on the streets, in the ovens of their homes, in the steaming rivers into which they had thrown themselves to escape the awful heat. There were few survivors, only those who happened to be inside the giant skyscrapers, protected by many thicknesses of crystal and steel...

But the Earthmen did not have a chance. The great sinister diskoids moved methodically over the Earth, high in the stratosphere, where the futile Earth planes could not reach them, and sent the terrible blaze of destruction down unerringly upon armies, cities, towns.

It was over soon. One after another, the Earth governments capitulated. America was the last—old Amos Peabody vowed he would rather go down to utter destruction than yield—but he was out-voted in Council. It was pure slaughter otherwise, without a chance to fight back...

"How do the diskoids operate?" he asked.

"Something like the sun rays on the one-man fliers," Grim told him, "only vastly more powerful. They are not limited in range, for one thing. It took only one, fifty miles up in the stratosphere, to destroy all New York. I saw the one that first spied on the Earth. It was about five hundred feet in diameter, made of the same vitreous material, and shaped like a huge lens. No doubt, besides being a space ship, it is just that. The sun's light flashes through it, is rearranged into terrible burning rays, and sears all in its path."